Kiyoshi (8/1) ran out an impressive winner of the Albany Stakes at Royal Ascot despite drifting violently to her right in the closing stages.
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The Charlie Hills-trained winner showed a sparkling turn of foot to burst clear down the centre of the track approaching the furlong marker but then, with Jamie Spencer forced to ride on one rein, she headed towards the far rail.
However she lost little momentum and was still clear of 7/4 favourite Sandiva, a fourth runner-up of the week for Richard Fahey.
Frankel's half-sister Joyeuse (6/1) emerged with plenty of credit in third.
"She's always been a very good filly, we've taken our time with her and really she wants seven furlongs or a mile. I think she has a bright future ahead of her. I hope the hanging was down to greenness, she didn't do it at Goodwood last time," the winning jockey told Channel Four Racing.
Winning owner Sheikh Fahad's racing manager David Redvers was particularly thrilled by the result, having purchased the filly himself.
He said: "I'd almost go as far to say this is the highlight of the whole thing. There was a lot of pressure on to produce the goods this week and we started the week well (Extortionist won on Tuesday), but that's almost forgotten.
"It's fantastic for Charlie. Her pedigree is a bit light but as soon as I saw her I fell in love with her."
Hills said: "She was pretty good there, wasn't she? She showed a great turn of foot and Jamie said he got to the front too soon. She really did pick up good.
"It's quite daunting on her third start running on a wide track. I can forgive her that (hanging across track)."
Asked whether Kiyoshi could be a 1000 Guineas candidate, Hills said: "I'd like to think so.
"Six weeks back I know Jamie rode the two fillies (Kiyoshi and Irish 1,000 Guineas winner Just The Judge) and he said he wouldn't know which one to give up if he had to choose one.
"She's going to stay very well as there's a lot of stamina on her dam side. I can't see any reason why she wouldn't (be a Guineas contender)."
The Cherry Hinton Stakes at Newmarket's July meeting could be next up for the hugely impressive winner.
Hills said: "She was a bit free at the start, but Jamie gave her a lovely, patient ride and there was plenty of pace up front.
"She is very laid-back, he gave her a little squeeze. She took off and almost got there too soon. She was breathtaking and showed some turn of foot.
"We'll see how she comes out of the race. We'll have a look at Newmarket for the Cherry Hinton.
"There's the Lowther later on at York and she has an entry in the Moyglare at the Curragh. We'll see.
"It's fantastic to get that first Royal Ascot winner. It had a been a long week up to now."
Trainer Richard Fahey was left ruing the fast ground after his fourth second of the week.
He said: "I've got seconditis. The winner picked up and we couldn't, but the ground is very fast and horses aren't enjoying it. She'll have a break and we'll step her up to seven (furlongs)."
Teddy Grimthorpe, racing manager for Joyeuse's owner Prince Khalid Abdullah, said: "It was a very good run. She settled well, she's still quite green but she was running on well at the end.
"She's still very progressive as it was only her second start. I don't know where we go now. It depends if we stay at six - then there's the July meeting - or we find her something else at seven."
Sky Bet introduced the winner to their market for next year's QIPCO 1000 Guineas at 8/1.
Spokesman Michael Shinners said: "That was visually very impressive beating what looked like a very good field easily. We are keen to keep her on side for the time being and are 8/1."